CVE-2006-3216: Clearswift Mailsweeper For Exchange

Medium severity, CVSS 5.0. EPSS: 1.9% chance of exploitation in the next 30 days.

Clearswift MAILsweeper for SMTP before 4.3.20 and MAILsweeper for Exchange before 4.3.20 allows remote attackers to cause a denial of service via (1) non-ASCII characters in a reverse DNS lookup result from a Received header, which leads to a Receiver service stop, and (2) unspecified vectors involving malformed messages, which causes "unpredictable behavior" that prevents the Security service from processing more messages.

Affected products

• Clearswift Mailsweeper For Exchange: up to and including 4.3.19
• Clearswift Mailsweeper For Smtp: up to and including 4.3.19

Published 2006-06-24. Last modified 2026-06-16.